20 g of water. specific heat of water is 4.18 J/x°C. temperature changes from

25° C to 20° C, how much heat energy (Q) moves from the water to the

surroundings?

418 Joules

4.18 J

209 J

83 J

If each vitamin has 0.8 grams of calcium, how much calcium will 2.6 vitamins have?

Analyze: The metallic character of an element is determined by how readily it loses electrons. Elements that lose electrons most easily have the greatest metallic character A. Which group has the greatest metallic character? B.

Students of diffrent ages were given the same jigsaw puzzle to put together. They were timed to see how long it took to finish the puzzle

Using the solubility of Ca (IO3) 2 that you determined in pure water, calculate the value of Ksp using only concentrations, that is assuming that all activity coefficients are 1.0.

Laboratory aprons or coats should be worn when working with A. electrical equipment. B. glassware of any kind. C. chemicals and heated substances. D. small animals when being handled.

Water is A. Acidic B. Basic C. Neutral

What variables affect the acceleration of an object and in what manner do they affect the acceleration?

How do valence electrons relate to the chemical reactions of an element?

What is the weighted-average mass of all known isotopes for an element

What is the Celsius equivalent of 212°f